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Yeah, exactly. Cash is a commodity like any other - the difference is that it tends to be tradable for any other commodity, which makes it more valuable than it would be on its own. Deflation can be seen as a bubble in cash, where the demand for it goes up. Inflation is a gradual increase in the supply of cash. Hyperinflation is a panic, where everybody tries to get rid of their cash at once.

And all these can be reversed: deflation could be a panic in goods, where nobody wants to hold hard assets. Or it could be an increase in the supply of goods, making cash more valuable relative to any one good. Inflation is a decrease in the supply of goods, like in the 1970s. Hyperinflation is a bubble in goods, when people hoard tangible assets and dump cash.